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ID:36463049
大小:2.55 MB
页数:7页
时间:2019-05-10
《安庆市近60年降水变化特征分析_梅智杰》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中国农学通报2014,30(2):265-271ChineseAgriculturalScienceBulletin安庆市近60年降水变化特征分析梅智杰,蒋跃林(安徽农业大学,合肥230036)摘要:为了研究安庆市近60年降水以及四季降水变化特征,并预测短期内安庆市降水趋势,为区内农业生产和防汛抗旱提供科学依据和指导,利用Morlet小波对安庆市近60年降水数据进行分析。结果表明,安庆市降水集中在春、夏2季,年降水量呈微弱递增趋势,经历6次丰枯循环,2010年后将进入新的丰水期。四季降水变化趋势各不相同,春季和秋季呈下降趋势,夏季和冬季呈上升趋势。安庆市近60年间小尺度周期震荡显著,周期
2、性强,年际间降水变化幅度大,降水丰枯交替频繁,易出现洪涝灾害和干旱,但是出现严重干旱的概率较小。春、夏季节时期,安庆地区受季风环流影响,大气环流年际变化频繁,降水变率大,丰枯交替频繁,小尺度周期震荡显著,年际间降水变化幅度大,突变点多,旱涝灾害频发。而秋、冬季节受西风带影响,盛行偏北气流,气流较春夏季节偏干燥,降水变率小,年际间降水变化幅度相对较小,旱涝交替较春夏季节缓慢,小尺度周期震荡不显著。关键词:降水变化特征;Morlet小波;周期震荡;丰枯交替;安庆市中图分类号:P-46文献标志码:A论文编号:2013-0704ChangeCharacteristicsofPrecipitati
3、onNearly60YearsinAnqingCityMeiZhijie,JiangYuelin(AnhuiAgriculturalUniversity,Hefei230036)Abstract:InordertostudytheprecipitationanditscharacteristicsatallseasonsofAnqinginnearly60years,andpredicttheprecipitationtrendofAnqinginshortterm,toprovidescientificbasisandguidancefortheagriculturalproducti
4、oninthearea,andguidanceforfloodcontrolanddroughtrelief.TheauthorusedMorletwavelettoanalyzetheprecipitationdataofAnqingcityinnearly60years.Theresultsshowedthat:theprecipitationconcentratedinspringandsummerandannualprecipitationwasincreasingslightly.Afterexperiencing6cycles,itwouldenteranewwetseaso
5、nafter2010.Thevariationtrendofprecipitationwasdifferentinfourseasons.Itwasonadecliningcurveinspringandautumn,butontheriseinsummerandwinter.Anqingcity’ssmallerscalecycleshockedsignificantlyinnearly60years,andithadastrongperiodicity.Theinter-annualrainfallchangedgreatlyandalternatefrequently.Floods
6、anddroughtwereeasytoappear,butseveredroughtwashardtoappear.Inspringandsummer,Anqingwasinfluencedbymonsooncirculation.Atmosphericcirculationchangedfrequentlyandinter-annualprecipitationvariedgreatly.Wetanddryalternatedfrequently.Smallscalecycleshockedsignificantly.Theinter-annualrainfallchangedgre
7、atlyanddroughtsandfloodsappearedfrequently.Whileitwasaffectedbythewesterliesinautumnandwinter,northairflowwasprevailed.Airwasrelativelydrierthanitinspringandsummer.Precipitationvariedsmaller.Theinter-annualrainfallchan
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